Bar AB rotates about fixed pin A with counterclockwise angular velocity wAB = 8.1 [rad/s] and counterclockwise angular acceleration aB = 1.2 [rad/s] at the instant shown where AB is vertical. Bar BC is pin-connected at B to bar AB and at C to a slider which moves in a vertical slot. Find at the instant shown: a) WBC, the angular velocity of link BC (consider counterclockwise as positive when reporting the answer); b) a BC, the angular acceleration of link BC (consider counterclockwise as positive when reporting the answer); and c) ac, the acceleration of the slider at C (consider upward as positive when reporting the answer). B 0.35 m WAB QAB 0.6 m 0.25 m C